A free radical is an atomic or molecular species with unpaired electrons on an otherwise open shell configuration.
Free Radical may also refer to:
Chemistry
- Free Radical Centre, a research center located in Australia that works in all areas of free radical chemistry
- Free-radical theory of aging
Arts and entertainment
- Film
- Free Radicals (1979 film), an American animated short by Len Lye
- Free Radicals (2003 film) (German: Bรถse Zellen), an Austrian film by Barbara Albert
- Literature and publications
- Free Radical (magazine), a New Zealand-based magazine
- "Free Radicals" (short story), by Alice Munro
- Free Radicals: The Secret Anarchy of Science, a book by Michael Brooks
- Music
- Free Radicals (band), an American band
- "Free Radicals", a song by American rock band The Flaming Lips on the album At War with the Mystics
- Video games
- Free Radical Design, a British video game developer
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